No theme styles in Guttenberg Editor

[strarsis]

Sage 10.0.0-beta.3 - Gutenberg editor style

Usually, for Gutenberg styles the normal frontend styles are added as editor styles. The Gutenberg editor will automatically wrap all frontend styles with an .editor-styles-wrapper class selector. This is required to scope the styles to the Gutenberg editor area, so the rest of the page (UI) is not also styled. Issue (with workaround/fix) for using the styles in Sage: Sage 10 followed a different approach (in alpha) some commits ago where the editor.scss was enqueued as the only styles (a…